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This Automatic Anti-Vacuum valve provides automatic protection against a vacuum forming in hot water installations. The solid brass structure allows for long-lasting use and the top of the valve features easy access to the internals. Servicing is fast and straightforward.Features & Benefits: RWC ADMT503010 Automatic Anti-Vacuum Valve - 3/4 inch, Easy to install, Top access to internals, Solid brass for long lasting use, For hot water installations. RWC ADMT503010 Automatic Anti-Vacuum Valve - 3/4 inch Reliance Water Controls (RWC)